Publication: Switching angle optimization analysis on low-level multilevel inverter
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Date
2023-08
Authors
Nazrun Naim bin Sobri
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Abstract
The increasing prevalence of inverters in industrial contexts and the renewable energy industry can be attributed to their outstanding performance, modular build and minimal harmonic distortion in the output voltage waveform. Consequently, there has been a significant requirement to enhance the functionality and output quality of Multilevel Inverter (MLI). This has led to the development of inverter technology, which aims to improve output quality by minimising harmonics and losses. Various methods can be employed to decrease the harmonic constituents, such as implementing diverse topologies that are appropriate for the intended application, and utilising enhanced modulation techniques. The chosen case study for this paper involves the implementation of a single-phase Cascaded H-bridge-MLI topology utilising independent DC sources. This study proposes a technique to improve the Total Harmonic Distortion (THD) value of the MLI through the utilisation of the Particle Swarm Optimization (PSO) algorithm to calculate the optimal switching angle for THD improvement. The algorithm will be implemented utilising MATLAB and subsequently applied to the three distinct level of CHBMLI, which has been designed using MATLAB Simulink. The observation of the output characteristics of the MLI will be conducted for 3-level,5-level, and 7-level of CHBMLI. The objective of optimising the switching angle is to decrease the THD of the output and enhance the efficiency of the MLI. The PSO successfully reduced the THD of the 5-L MLI.